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3DP Modularized Finger PIPJ Arthroplasty

Min. size of phalanx Top Major axis: 57% Minor axis: 70% Bottom Major axis: 37% Minor axis: 37%

Middle size of phalanx Top Major axis: 65% Minor axis: 52% Bottom Major axis: 47% Minor axis: 35% Left column: worst case definition; right three columns: ratios of the medullary cavity and the cross-sectional area at stem top and bottom sides of the phalanx for largest, medium size (averaged size) and

Max. size of phalanx Top Major axis: 72% Minor axis: 40% Bottom Major axis: 48% Minor axis: 30%
Table 2. The ratios of the medullary cavity and stem cross-sectional area.

Worst structure case 0% (articular surface) to 0% (stem) 10% (articular surface) to 0% (stem) 10% (articular surface) to 10% (stem) 20% (articular surface) to 10% (stem) 20% (articular surface) to 20% (stem) 5 sets can be placed in this largest phalanx the smallest size among the 48 phalanges

158 72% International Journal of Bioprinting (2022)–Volume 8, Issue 3